Calculator casing



FIG. 1 is a view in perspective of a calculator casing showing my new design;

FIG. 2 is a side elevational view thereof on an enlarged scale;

FIG. 3 is a plan view thereof on an enlarged scale;

FIG. 4 is a front elevational view thereof on an enlarged scale; and

FIG. 5 is a back elevational view thereof of an enlarged scale.

The bottom side of the calculator casing is plain and conventional. 

The ornamental design for a calculator casing, substantially as shown and described. 